The purpose of the study is to acquire kinematic in vivo fluoroscopy data using the University of Tennessee's tracking fluoroscopy system (TFS) from subjects who were implanted with the Smith & Nephew Journey II posterior cruciate retaining (PCR) total knee arthroplasty (TKA) or Journey II bi-cruciate retaining (BCR) TKA. CMR has previously collected data for the Smith & Nephew BCS TKA and compared these kinematics data to those of normal knees.